Telephone receiver



` 1,602,814 w. DUBILIERH TELEPHONE RECEIVER Mp7 A TTU/m1 1 Original Filed May 29. 1922 Oct. 12 1926.

Patented Oct. 12, 1926.

UNITED STATES WILLIAM DUBILIER, or NEW ROCHELLE; NEW YORK.

TELEPHONE RECEIVER.

Application med may 2a, 19221 seriai No. 564,539. Renewed :une s. 192e.

This invention has for one of its purposes to provide an improved type of telephone receiver such as is used for telegra h and telephone purposes with a iexible vi rating diaphragm.

Another object is the provision of tele-- phone receiver in which se arate paths are provided for the lines of or'ce of the electro-magnet and of the permanent magnet.

St-illanother object is the provision in a telephone receiver of a by-pass for the electro-inagnetic lines of force.

Still another object is theprovision f a telephone receiver in which the core of lthe electro-niagnet-is composed of aplurality of insulated elements.

These objects are attained by the novel construction, combination and arrangement of parts hereinafter described'and shown in the accompanying drawings, forming an essential part of this disclosure and in which;

Figure 1 is a diagrammatic side elevational view showing a conventional'type of permanent magnet having an adaption of the invention incorporated therein and illiistrating its application with reference to a diaphragm.

Figure 2 is a plan View of a receiver showing cover removed to disclose the interior.

Figure 3 is a transverse sectional view taken on line 3 3- of Figure 2, withthe cover applied.

The numeral 10 is lused in Figure 1 to designate the looped portion of common type of permanent magnet, from the ends 0f which extend the y ole pieces-11 and 11',

Held between t ese pole pieces are the arms 12 and 12 of a U shaped core 13 made of soft iron and interjacent the arms and poles are strips of non-magnetic material 14 and 14', the base of the core element 13 acting as a by-pass for the electro-magnetic lines of force.

A coil 15 of wire encircles the pole piece 11 and arm 12 continuing as at 16 and to coil 15 and encircling the opposite pole 11 andI arm l2', this wire being vin electrical engagement with the source of electrical energy.

be attracted and repelled byforces flowing4 from the combined ends of the magnets as the coils are energized.

When used as a telephone lreceiver a weak -tween the ends of the combined arms and the diaphragm 23, ren ering its alternating current passes through the electro-magnet, setting up an alternating electro-magnetic field. In the common type of telephone receiver used at present, the alternating magnetic lines must travel through the permanent magnet which offers a tremendous resistance, or throughthe air which also has a ver)7 great reluctance thus oering a great resistance to the alternating electro-magnetic lines of force. f y

I have found that by dividing the core of the electro-magnet into two parts as described above, a path of the least possible resistance is offered for the electro-magnetic lines of force, but Without-destroying the effect of the permanent magnet, with the result that We obtain much more eicient operation.

The U shaped core element 13 is made preferably of laminated sheets of soft iron or steel and the pole piece 11 and 11 of the permanent magnet 10 are also prefer ably made of soft iron or steel as is well known in the construction of cores for electro-magnets. 1-

Due to vthe shape of the soft iron core element 13, a path of the least resistance is provided for the electro-ma etic lines of force, the gap between the po es being essentially bridged, and the energy directed to the diaphragm 17 in a manner which will be readily understood.`

In Figures 2 and 3 of drawing I have shown an embodiment. of my invention in what is commonly knownas a Watch-case typereceiver. j

The inner ends of thestrips 2f? and 27 are turned vertically upward at a right angle, forming poles 29 and 29', and between them are supplementary pole arms 31 and 31 formed with a connectingbase 32 substantially as before described as a U shaped core element, the adjacent pole arms' being linsulated one-from the other by non-magnetic material 33 and 33.

`Each magnet core so formed has Wound upon it, coils 34 and 34', connected at 35 and having their opposite ends in circuit with a source of electric energy.

' Thus it will be seen that the core of each magnet is comprised of two distinct core elements and that these elements are integral with each other; making a shorter path for electro-magnetic lines of force than exists beoles and response more sensitive and prompt in its vibration iiuctuations.

Both of the embodiments illustrated are substantially alike and present means for increasing eciency of operation by the use of a closed electro-magnetic eld, and an air gap only between the pole pieces and the diaphragm,

However, as changes of construction could be made within the scope of the invention, it is intended that all matter contained in the foregoing description, or shown in the accompanying drawings, shall be interpreted as being illustrative and not in a limiting sense.

Having thus described my invention what l claim as new and desire to secure by Let- 1. A telephone receiver comprising a diaphragm, a magnet having a. pole piece presented to the diaphragm, a second magnet including v,arms having their extremities in proximity to the diaphragm to act thereon, and a coil encircling said magnets, the second magnet providing a path of relatively low reluctance. 2. A telephone receiver comprising a diaphragm, a magnet having a pole piece presented to the diaphragm, a second magnet including arms having their extremities in proximity to the diaphragm to act thereon, and a coil encircling said magnets, the second magnet providing a path of relatively low reluctance, said second magnet being out of magnetic Contact with the first magnet.

3. A telephone receiver comprising a .dia-

phragm, a magnet having a pole piece presented to the diaphragm, a second magnet including arms having their extremities in proximity to the diaphragm to act thereon,

and a coil encircling the pole piece and an arm of the second magnet, the second magnet providing a path of relatively low reluctance.

4. A telephone receiver including a diaphragm, a magnet having a pole piece presented to the diaphragm, a second magnet including arms having their extremities in proximity to the diaphragm to act thereon, and a coil encircling the pole piece and an arm of the second magnet, the second magnet providing'a path of relatively low reluctance, the second magnet being out of magnetic Contact with the first magnet.

5. A telephone receiver comprising a diaphragm, a magnet having pole pieces presented to the diaphragm, a second magnet including a pair of connected arms between said pole pieces, the extremities of said arms being in proximity to the diaphragm to act thereon, and windings encircling each pole piece and the arm adjacent thereto, the second magnet providing a path of relatively low reluctance between said pole pieces.

6. A telephone receiver comprising a diaphragm, a magnet having pole pieces presented to the diaphragm, a second magnet including a pair of connected arms between said pole pieces, the extremities of said arms being in proximity to the diaphragm 1to act thereon, and windings encircling each pole piece and the arm adjacent thereto, the second magnet providing a path of relatively low reluctance between said pole pieces, the arms of the second magnet being out of magnetic contact with said pole pieces.

Signed at New York in the county of New York and State of New York this 19th day of May A. D. 1922.

WILLIAM DUBLIER. 

